RFR: 8283789: CompilerPhaseTypeHelper::to_bitmask should operate on uint64_t

[Aleksey Shipilev]

[JDK-8281505](https://bugs.openjdk.java.net/browse/JDK-8281505) added this helper method that operates on `uint64_t` masks, but it operates on `int`s. So it is subtly broken on 32-bit platforms, for example. SonarCloud complains about it: "The result of the left shift is undefined due to shifting by '32', which is greater or equal to the width of type 'int'"

Additional testing:
 - [x] Linux x86_64 fastdebug, `compiler/oracle` passes
 - [x] Linux x86_32 fastdebug, `compiler/oracle` passes

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/7994/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7994&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283789
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7994.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7994/head:pull/7994

PR: https://git.openjdk.java.net/jdk/pull/7994